I purchased these 2 double wide X-metal cases in California yesterday for $50 each. I picked them up out of an old closed down Optometrist office. So they have never been in a residence. The side plexiglass & shelves don’t even have scratches on them. The aluminum on the one with the lower handles is twice as thick on the sides & is heavier then the other one. Anyone know why there is a difference? Were they produced a different times or just different models?